PWM signal isolated transmission circuit

Abstract

The invention discloses a PWM signal isolated transmission circuit which comprises a modulation isolation circuit and a latch circuit. First and second input ends of the modulation isolation circuit receive first and second PWM signals from a controller and modulate the first and second PWM signals respectively to obtain first and second modulation signals whose polarity is opposite to each other,and provides the isolated reference ground potential; and the setting, reset and reference ground input ends of the latch circuit are connected to first, second and third output ends of the modulation isolation circuit respectively, and the latch circuit is used to demodulate the first and second modulation signals according to the isolated reference ground potential to obtain a first output signal whose polarity is opposite to that of the first PWM signal and a second output signal whose polarity is the same with that of the first PWM signal. The problem that a pulse transformer tends to magnetic saturation can be solved effectively, the duty ratio of the PWM signals can be adjusted randomly, and stable level establishing time of the output signal is eliminated.

Description

technical field [0001] The invention belongs to the field of digital signal isolation transmission, and more specifically relates to a PWM signal isolation transmission circuit. Background technique [0002] Industrial equipment often needs to work in harsh environments, especially in high-temperature environments. As the core of controlling the operation of industrial equipment, electronic equipment also needs to have a certain ability to withstand high temperatures. The anti-interference ability of digital signals is much greater than that of analog signals, so in practical applications, signals are usually transmitted in the form of digital signals. [0003] The PWM (Pulse Width Modulation, pulse width modulation) signal corresponds to the binary code "1" and "0" with positive level and zero level respectively, and is a unipolar digital signal. PWM signals are directly transmitted under high temperature and high pressure environment, which will seriously endanger the saf...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and improvement needs of the prior art, the present invention provides a PWM signal isolation transmission circuit. Adjust and eliminate the settling time of output signal stable level

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